package com.broada.apm.util;

import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.Collections;
import java.util.Comparator;
import java.util.Date;
import java.util.List;

public class ComparatorUtil {

	/**
	 * 对List对象按照某个成员变量进行排序
	 * 
	 * @param list
	 *          List对象
	 * @param sortField
	 *          排序的属性名称
	 * @param parent
	 *          是否为父类属性
	 *          true:是 false 否
	 * @param sortMode
	 *          排序方式：true，false 任选其一
	 */
	public static <T> void sortList(List<T> list, final String sortField, final boolean parent, final boolean sortMode) {
		Collections.sort(list, new Comparator<T>() {
			@Override
			public int compare(T o1, T o2) {
				try {
					Class clazz = o1.getClass();
					Class paranClazz = clazz.getSuperclass();
					Field field = null;
					if (parent)
						field = paranClazz.getDeclaredField(sortField); // 获取成员变量
					else
						field = clazz.getDeclaredField(sortField);
					field.setAccessible(true); // 设置成可访问状态
					String typeName = field.getType().getName().toLowerCase(); // 转换成小写

					Object v1 = field.get(o1); // 获取field的值
					Object v2 = field.get(o2); // 获取field的值

					// 判断字段数据类型，并比较大小
					if (typeName.endsWith("string")) {
						String value1 = v1.toString();
						String value2 = v2.toString();
						return sortMode ? value1.compareTo(value2) : value2.compareTo(value1);
					} else if (typeName.endsWith("short")) {
						Short value1 = Short.parseShort(v1.toString());
						Short value2 = Short.parseShort(v2.toString());
						return sortMode ? value1.compareTo(value2) : value2.compareTo(value1);
					} else if (typeName.endsWith("byte")) {
						Byte value1 = Byte.parseByte(v1.toString());
						Byte value2 = Byte.parseByte(v2.toString());
						return sortMode ? value1.compareTo(value2) : value2.compareTo(value1);
					} else if (typeName.endsWith("char")) {
						Integer value1 = (int) (v1.toString().charAt(0));
						Integer value2 = (int) (v2.toString().charAt(0));
						return sortMode ? value1.compareTo(value2) : value2.compareTo(value1);
					} else if (typeName.endsWith("int") || typeName.endsWith("integer")) {
						Integer value1 = Integer.parseInt(v1.toString());
						Integer value2 = Integer.parseInt(v2.toString());
						return sortMode ? value1.compareTo(value2) : value2.compareTo(value1);
					} else if (typeName.endsWith("long")) {
						Long value1 = Long.parseLong(v1.toString());
						Long value2 = Long.parseLong(v2.toString());
						return sortMode ? value1.compareTo(value2) : value2.compareTo(value1);
					} else if (typeName.endsWith("float")) {
						Float value1 = Float.parseFloat(v1.toString());
						Float value2 = Float.parseFloat(v2.toString());
						return sortMode ? value1.compareTo(value2) : value2.compareTo(value1);
					} else if (typeName.endsWith("double")) {
						Double value1 = Double.parseDouble(v1.toString());
						Double value2 = Double.parseDouble(v2.toString());
						return sortMode ? value1.compareTo(value2) : value2.compareTo(value1);
					} else if (typeName.endsWith("boolean")) {
						Boolean value1 = Boolean.parseBoolean(v1.toString());
						Boolean value2 = Boolean.parseBoolean(v2.toString());
						return sortMode ? value1.compareTo(value2) : value2.compareTo(value1);
					} else if (typeName.endsWith("date")) {
						Date value1 = (Date) (v1);
						Date value2 = (Date) (v2);
						return sortMode ? value1.compareTo(value2) : value2.compareTo(value1);
					} else {
						// 调用对象的compareTo()方法比较大小
						Method method = field.getType().getDeclaredMethod("compareTo", new Class[] { field.getType() });
						method.setAccessible(true); // 设置可访问权限
						int result = (Integer) method.invoke(v1, new Object[] { v2 });
						return sortMode ? result : result * (-1);
					}
				} catch (Exception e) {
					e.printStackTrace();
				}
				return 0; // 未知类型，无法比较大小
			}
		});
	}

}
